Coastal Cleanup Day: Volunteers are needed to clean up various sections of Los Gatos Creek. Students participating in the cleanup can earn three hours of community service credit. Sept. 21, 9 a.m.-noon. Creekside Sports Complex, 930 University Ave., Los Gatos. www.cleanacreek.org.

DogFest Walk 'n' Roll: The Canine Companions for Independence South Bay chapter hosts this fundraiser for the organization, which trains highly skilled service dogs for children and adults with disabilities. Sept. 21, 9 a.m. Vasona Lake County Park, 333 Blossom Hill Road, Los Gatos. Visit http://bit.ly/dogfestsilliconvalley to for more information or to register.

David Rogers: Rogers plays a show based around Spanish guitar favorites, covers of Leonard Cohen's "Hallelujah," "Suzanne" and "Sisters of Mercy" and the Rolling Stones' "Wild Horses" and "Under My Thumb," as well as music by the Beatles, J.S. Bach and Chick Corea. Sept. 20, 7:30-10 p.m. The Woodshed at Keith Holland Guitars, 16905 Roberts Road, Los Gatos. $18 advance/$22 door. 408-395-0767 or woodshed.org.

Opera Lecture Series: The San José Opera Guild, in conjunction with the JCC of Silicon Valley, presents a series of opera lectures Tuesdays through Nov. 19, 10 a.m.-noon. On Sept. 17, general director José Luis Moscovich and singers from West Bay Opera preview the company's upcoming season, which features "Tosca" by Puccini, "L'Elisir d'Amore" by Donizetti and Mozart's "Die Zauberflöte." Addison-Penzak Jewish Community Center of Silicon Valley, 14855 Oka Road, Los Gatos. $10 door/free for JCC and San Jose Opera Guild members. sjoperaguild.org/fall_series.html.

Evolution of Green: An exhibit highlighting environmental activism in the Santa Clara Valley over the past 50 years and featuring interactive models, historical narrative, environmental soundscapes and other media to interpret this history and explore proposed future steps for environmental activism. Through Sept. 22. History Museum of Los Gatos, 75 Church St. museumsoflosgatos.org/site/2013/historymuseum.

Lectures/Meetings

Caregivers Support Group: "Caregivers Count" is for those caring for a parent, grandparent or client. Meets the first and third Tuesdays of each month, 2:30-4 p.m., starting Sept. 17. Los Gatos Adult Recreation Center lounge, 208 E. Main St., Los Gatos. Free. Contact LGS Recreation's 55 Plus Program at 408-354-1514.